8 June 2006 (Nhan Dan) – Short report on a Dong Son weapon find, including a trident and axe.
Ancient bronze weapons unearthed in Lao Cai province
These original antiques include an intact trident, which is 13 cm long and 7.5 cm wide and has 4 barbed points, and an axe with patterns typical of the Dong Son Culture. Though buried underground for thousands of years, the metal is still in good condition.
The Bronze Age of Southeast Asia (Cambridge World Archaeology) by C. Higham
Van Hoa Dong Son / Dong Son Culture – Its Unity and Diversity by Pham Minh Huyen